Where some promotions occur

• One with common sense bottling hydrogen - to begin with engineer's not outsourced
• Produced by its own staff
• Not contracted out, say
• Not farmed out
• Done by its own staff
• Employed around head office, not contracted out
• Like many company publications
• Not done externally
• Done by its own staffers

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also in-house , 1955, from in + house .